Not boosting properly past 4K RPM?

[gsxsoul]

So in basically any gear my car stops boosting/running properly past 4K RPM. It feels like fuel cut actually. Car is a 95 GSX with a 6bolt 4G63 from a Galant VR-4. Mods include GReddy SP exhaust, ADFX SMIC, Dejon Tool UICP, HKS BOV, and an Injen intake.

I should also note that before this I had a garage do the swap for me and they screwed up, basically plugging in my BOV line into the intake, so my BOV wasnt going off, just compresser surge. I have since fixed this, but also the hose that comes out of the head that plugs into the intake was cut, so right now I just plugged up that hole in the intake.

Anyone know what might be the issue?

EDIT: I should mention that when the car hits 4K RPM, if I just keep on the gas (WOT or not) it feels like the engine is just cutting in and out.

 

[CiscoBite1Time]

time to do a boost leak test.

 

[DaisyTuner]

blt first. check your spark plugs. check your fuel pump and its filter. what psi are you boosting? could be anything really but well help you close in on it just send us a lil more info

 

[PieEyedPiper]

Spark plug wires solved my problem.

 

[gsxsoul]

Hmm...my friend did take a look at my spark plugs and said that those are going, so I'll try changing those out first as well as doing a boost leak test. Thanks so far

 

[slowasdsm]

Are you running on stock turbo and stock boost?

 

[gsxsoul]

Yes I am.

 

[killer_eclipse]

do a boost leak test.... i split a coupler and my car ran fine but fell on its face whenever it hit 4k

 

[Iowa99GST]

Make sure you are gaping the spark plugs propery =) Easy thing to look over, but that could be your problem as well, my car had the same issue, would get into higher rpms and would cut out/fall flat on it's face, changed the plugs and wires and made sure they were gaped properly and it did wonders, until I blew my engine =( Lol.

 

[95 TsiAWD]

most likely an ic pipe coupler was installed improperly. I'd do a once over on those and you should be good!

 

[buddaboost]

I had the same problems. do a boost leak test first. Than if the problem doesn't go away check plugs and wires. If it still doesn't go away. Get a timing light and check your base timing Mine was way off from previous owner. Had it set to over 20 degrees advanced. The computer starts pulling everything than. I'm surprised I didn't blow it up doing a couple pulls when i first got the car

 

[Brandon_87]

So in basically any gear my car stops boosting/running properly past 4K RPM. It feels like fuel cut actually. Car is a 95 GSX with a 6bolt 4G63 from a Galant VR-4. Mods include GReddy SP exhaust, ADFX SMIC, Dejon Tool UICP, HKS BOV, and an Injen intake.

I should also note that before this I had a garage do the swap for me and they screwed up, basically plugging in my BOV line into the intake, so my BOV wasnt going off, just compresser surge. I have since fixed this, but also the hose that comes out of the head that plugs into the intake was cut, so right now I just plugged up that hole in the intake.

Anyone know what might be the issue?

EDIT: I should mention that when the car hits 4K RPM, if I just keep on the gas (WOT or not) it feels like the engine is just cutting in and out.

I have had the exact same problem and tried to find an answer as well, I just purchased a 98 GS-T and it does the same thing, except I have no oil pressure as well, are they related?

 

[1cleanreddsm]

So in basically any gear my car stops boosting/running properly past 4K RPM. It feels like fuel cut actually. Car is a 95 GSX with a 6bolt 4G63 from a Galant VR-4. Mods include GReddy SP exhaust, ADFX SMIC, Dejon Tool UICP, HKS BOV, and an Injen intake.

I should also note that before this I had a garage do the swap for me and they screwed up, basically plugging in my BOV line into the intake, so my BOV wasnt going off, just compresser surge. I have since fixed this, but also the hose that comes out of the head that plugs into the intake was cut, so right now I just plugged up that hole in the intake.

Anyone know what might be the issue?

EDIT: I should mention that when the car hits 4K RPM, if I just keep on the gas (WOT or not) it feels like the engine is just cutting in and out.

When you hit "fuel cut" you'll feel it, it's like your tranny bailed out or you slammed into a wall, so no, you do not have fuel cut.

Do a leak test and use a spray bottle with water and find the leak and fix it. Most common areas are the Throttle body area, bov itself, and couplers. Sounds like you have a moderate leak to sense boost at 4k rpm, and make sure your vaccum lines are properly sourced back to the original nipples, most importantly from your bov to the Intake manifold vaccum line, which allows your bov to open and close. And that line from the head to the intake, you'll want to reconnect that, as it allows your head to breathe and the pcv to work properly. Might want to get an oil catch can between that line too.

I have had the exact same problem and tried to find an answer as well, I just purchased a 98 GS-T and it does the same thing, except I have no oil pressure as well, are they related?

A boost leak shouldn't affect oil pressure. Just check your oil pressure sensor, the wire on the sensor usually have a tendency to break off. Don't confuse causation with correlation.

 

[92spoolin']

Do you have an aftermarket chip in the ecu or some sort of tunning device you could have an issue with the speed sensor. It could be ready that the car is sitting still and just going on to the 2 step I had an issue with that on my 95 6 bolt swap.

 

[Brandon_87]

When you hit "fuel cut" you'll feel it, it's like your tranny bailed out or you slammed into a wall, so no, you do not have fuel cut.

Do a leak test and use a spray bottle with water and find the leak and fix it. Most common areas are the Throttle body area, bov itself, and couplers. Sounds like you have a moderate leak to sense boost at 4k rpm, and make sure your vaccum lines are properly sourced back to the original nipples, most importantly from your bov to the Intake manifold vaccum line, which allows your bov to open and close. And that line from the head to the intake, you'll want to reconnect that, as it allows your head to breathe and the pcv to work properly. Might want to get an oil catch can between that line too.



A boost leak shouldn't affect oil pressure. Just check your oil pressure sensor, the wire on the sensor usually have a tendency to break off. Don't confuse causation with correlation.

Well... I checked under the car and looked all around for a loose or not-connected wire and didn't see one. It seems like every problem I have encountered I have googled and it has brought me to this site for answers. I have always dreamed of owning a 97 gs-t/gsx and somehow I ended up with a prelude that I turned into a 12 second. Car and a integra that I turned into a 11 second car but enough was enough, I sold the integra when I found a clean 98 gs-t! Only thing was that it has 235k on it, so I'm trying to make it last.

So far I have had:
1. Car fall on its face after 4k, I changed the plugs and it was fine.

2. Car will not boost after 4k, I'm still in the middle of this but I just ordered a set of MSD wires and I'm going to get a boost leak test done next weekend.

3. Car smelled like burning oil but oil was just changed, I changed the PCV valve and hose and it was fine.

4. Oil pressure gauge not working

5. Broken mounts, I'm ordering poly urathane inserts

6. Hatch struts not working, I ordered new ones.

I also had a CEL while driving it home from Cali. And it was a TPS sensor, but I threw in 3 gallons of 100 octane and it went away....

What else do I have to look out for?